Right next to the background tuning enable on the tune page is a parameter called 'TMPTUN'. This
enables temperature tuning for the oscillators. With this enabled, you can actually leave
background tuning off and the A6 will stay in tune. Each oscillator chip has a temperature sensor
that always reports the current chip temperature to the A6 engine. The engine compensates for the
difference between the current chip temperature and the temperature that was recorded when the
oscillator was last tuned. This difference is applied to the oscillator pitch. So if you're playing a gig
in a hot room and someone opens the door to let a blast of cold air in, the A6 will stay in tune. When
background tuning is on, the engine continuously re-tunes all of the unused voices. This takes up a
lot of processor bandwidth, and while that's not a problem, it makes the other top-level routines (like
servicing the pots) a tiny bit slower. Temperature tuning operates in real time in the engine, so no
extra bandwidth is taken up. Also, background tuning can't tune voices while they are being played.
If temperature tuning isn't on, a voice can go out of tune if it is played continuously. If you hold a
note down for a few (5 or 10?) minutes, the oscillator chip will heat up and detune the voice's pitch
according to how hot the chip is. You can play with the TMPTUN parameter, turning it on and off
and hear the difference in pitch -while the voice is still playing! I would suggest trying turning
background tuning off, leaving temperature tuning on and see if you can hear any differences. I'd
be interested to hear how this works for y'all.
21.6 solving ground loop problems
Anthony Wright wrote:
my a6 is having some HORRIBLE line noise problems.
Now, my studio is kind of wirey. I mean it's a bit of a spaghetti factory back there. But none of my
other gear is affected by this too much.
However, the a6 is putting out some major hum at all times. it changes depending on which outlet i
use, but still...it is incredibly loud.
anyone have any suggestions?
1. Keep your cables as short as possible.
2. Use good quality cables with extra shielding.
3. Do not power the A6 and mixer or outboard gear by the same power outlet.
4. Use a line conditioner, with spike and voltage regulator if possible, a computer UPS battery
system is expensive but will do the best job.
5. Lots of cables are OK, but they should be not in parallel with each other, try looping them or jut
keep them as far as apart as posible....
6. Every cable is really an "antenna", you might buy from a radioshack some graphite rings, and
use them arround the problem cable... that can cancel out RF contammination...
7. Allways keep power cables and audio cables as far from each other as possible!
8. AS A LAST RESORT: Buy a 3 prong to 2 prong converter, to isolate ground.
Kevin Montouri adds:
have you tried plugging in the A6 into the same powerstrip as your mixer? if a room is wired on two
circuits (not unusual) having one plugged into one circuit and your mixer into the other could be
creating the problem. with ground loops you're looking for sameness, not differentness.
Steve adds a tidbit:
One other small thing to mention is that if you have a light dimmer switch on the circuit, I believe that
can add lots of noise and buzz to your power (whether it's on or off). But, you'd probably already
have heard that with your setup if it were a problem.
Colin adds a tidbit too:
Your problem is happening because there is more than one source of grounding. The midi cable,
the audio cable and the ground pin in the power lug. To reduce or eliminate the effect of ground
loops, we have to follow just one simple rule: each piece of equipment should have only one earth
current path between it and the rest of the system to which it is connected. To comply with this rule,
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